Eve of the Apocalypse: Twilight

I want to make a list of what spells cannot be used on flying units so I can start a discussion on which spells should or shouldn't be able to be used on them. If anyone would like to help me do this that would be great. Off my memory I know that Polarize, Arctic Cataclysm and Avalanche do not work.

List so far:
Polarize, Arctic Cataclysm, Avalanche, AoO, Mines, Mind Fog, Root portion of Entangling Seed, Entangling Treant, Ravenous Dive, Swoop, Shattering Strike, Gravebind.

Possible spells that may not work:
Siphon Glyph, Terra Smash.

Backstab also

Explosives

I seem to remember Backlash not working against air. Also Ravenous dive. I am sure the damage part of Siphon Glyph hits them, but am drawing a blank on the mana drain part.

Mind Fog as well.

Thanks for the help so far guys.

Yggdrasil's Entangling Treant (Which does hit and immobilize when the target is netted, interestingly enough.)

Shattering Strike, but he can ground fliers with his freeze spell.

Terra Smash? I think the slow may work, not sure about the dmg portion, to my knowledge, I don't remember it dealing dmg...

I didn't see it on your list, and haven't played Garg in a while.